using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
         delegate void CsDemoDelegate(string msg);
        static event  CsDemoDelegate csEvent;
        static void Main(string[] args)
        {
            csEvent += Method;

            if (csEvent != null)
            {
                csEvent.Invoke("xx");
            }
        }

        static void Method(string msg)
        {
            Console.WriteLine(msg);
        }
    }
}